docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections

Comprehensive technical documentation covering:
- Hardware: OCS/ECS/AGA custom chip registers, Copper & Blitter deep dives
- Boot sequence: cold boot through startup-sequence
- Binary format: HUNK executable spec, relocation, debug info
- Linking & ABI: .fd files, LVO tables, register calling conventions
- Exec kernel: tasks, interrupts, memory, signals, semaphores
- AmigaDOS: file I/O, FFS/OFS layout, CLI/Shell scripting
- Graphics: planar bitmaps, Copper programming, HAM/EHB modes
- Intuition: screens, windows, IDCMP, BOOPSI
- Devices: trackdisk, SCSI, serial, timer, audio, keyboard
- Libraries: utility, expansion, IFFParse, locale, ARexx
- Networking: bsdsocket API, SANA-II, TCP/IP stack comparison
- Toolchain: GCC, vasm/vlink, SAS/C, NDK, debugging
- Reverse engineering: IDA/Ghidra setup, compiler fingerprints, case studies
- CPU & MMU: 68040/060 emulation libs, PMMU, cache management
- Driver development: SANA-II, Picasso96/RTG, AHI audio

All files include breadcrumb navigation. No local paths or proprietary content.

11_libraries/expansion.md

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+[← Home](../README.md) · [Libraries](README.md)
+
+# expansion.library — Zorro Bus and AutoConfig
+
+## Overview
+
+`expansion.library` handles automatic configuration of Zorro II/III expansion boards. At boot, the OS scans the expansion bus and assigns base addresses to each board based on its AutoConfig ROM.
+
+---
+
+## AutoConfig Sequence
+
+1. Board asserts `CFGIN` to request configuration
+2. CPU reads 256-byte config area at `$E80000`
+3. Board reports: manufacturer ID, product ID, board size, flags
+4. OS assigns a base address via `WriteExpansionByte`
+5. Board relocates to assigned address
+6. Next board in chain is configured
+
+---
+
+## struct ConfigDev
+
+```c
+/* libraries/configvars.h — NDK39 */
+struct ConfigDev {
+    struct Node      cd_Node;
+    UBYTE            cd_Flags;       /* CDF_* flags */
+    UBYTE            cd_Pad;
+    struct ExpansionRom cd_Rom;      /* AutoConfig ROM data */
+    APTR             cd_BoardAddr;   /* assigned base address */
+    ULONG            cd_BoardSize;   /* board size in bytes */
+    UWORD            cd_SlotAddr;    /* slot address */
+    UWORD            cd_SlotSize;
+    APTR             cd_Driver;      /* driver bound to this board */
+    struct ConfigDev *cd_NextCD;     /* next in chain */
+    /* ... */
+};
+
+struct ExpansionRom {
+    UBYTE  er_Type;          /* board type + size code */
+    UBYTE  er_Product;       /* product number */
+    UBYTE  er_Flags;
+    UBYTE  er_Reserved03;
+    UWORD  er_Manufacturer; /* manufacturer ID */
+    ULONG  er_SerialNumber;
+    UWORD  er_InitDiagVec;  /* boot ROM offset */
+    /* ... */
+};
+```
+
+---
+
+## Finding Expansion Boards
+
+```c
+struct Library *ExpansionBase = OpenLibrary("expansion.library", 0);
+struct ConfigDev *cd = NULL;
+
+while ((cd = FindConfigDev(cd, 2167, 11))) {
+    /* manufacturer=2167 (Individual Computers), product=11 (ACA500plus) */
+    Printf("Board at $%08lx, size %lu\n", cd->cd_BoardAddr, cd->cd_BoardSize);
+}
+```
+
+---
+
+## Common Manufacturer IDs
+
+| ID | Manufacturer |
+|---|---|
+| 514 | Commodore |
+| 2017 | GVP |
+| 2167 | Individual Computers |
+| 8512 | Phase5 |
+
+---
+
+## References
+
+- NDK39: `libraries/configvars.h`, `libraries/expansion.h`
+- ADCD 2.1: expansion.library autodocs